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If you've not loaded your DB, then the easiest thing to do would be uninstall everything, and reboot, use some cleaning tool like ccleaner and clean the registry, then reboot again and do a clean install. When you get components that do not work, there may be way more wrong than initially appears--just start over.
Please note: the ccleaner or registry cleaning tool is for more than just cleaning up your uninstall hangarounds, it's to clean your registry so it's ready for the oracle install. Dirty registry's in Windows are suspect and cause in almost all of my failed installs on Windows based Dev boxes.